Drupal 8 commerce Too Much Product Variation and Attributes to create

Hello !!

I have a big Problem with product variation and attribute with drupal 8.

i am newbies in drupal.

I have installed Drupal 8.4 and Commerce 2. All it is done with composer.

I want to create a declinaison of product like this

Product A
Attribute Size :1,2,3,4,5,6,7,8,9,10,11,12,13,14,15
Attribute Quality : 10,14.18

I have created this 2 atrributes in admin/commerce/product-attributes
After that i have created product variation type in admin/commerce/config/product-variation-types where i have created : Size and Quality Product Variation Type.

After that i have created Product type link with this product variation type (Size and Quality).

Some variation increase the price but not all.

My problem is:
When i create a product, I must create 45 Variations !!! So i have other products where i have to create more than 500 variations !!!!!!!

Do you know how to avoid this ???
Module ? Or anything else ?

Thank you very much

Drupal version: 

Source: https://www.drupal.org/taxonomy/term/22/feed